They say that in any disaster there are a chain of events and if any link is broken the disaster doesn't happen. Here is my chain link by link:
I went to the range today primarily to do some 223 shooting but brought the Grendel upper along to do some accuracy testing with Hornady 123 SST factory. The 223 shooting went off uneventfully. I changed out uppers and began shooting the Hornadys. After a couple of 3 shot groups I decided to fire a full 10 round group. Here in NJ we are restricted to 10 round mags. I have a ASC 10 and I found it wouldn't load but 9 rounds. I manually chambered a round then inserted the mag with 9 more. First shot went off normally. Second was a click. Knowing that the Grendel has a reputation for unreliable magazines I presumed it was a mag problem. I manually worked the charging handle and tried again. Another click. Taking the rifle out of the rest I very carefully brought the handle to the rear and let it fly forward. It stripped a round but failed to chamber. Dropping the mag I had to bang the butt stock while pulling on the handle to extract the round. Here is one of those links...I was using Caldwell bras catcher and did not see the case when it came out. I reinserted the magazine and cycled the charging handle again. Another failure to chamber. I removed and looked for some blockage in the rifle and my blood ran cold. There was a bullet stuck in the lands. The first attempt to manually charge the rifle had pulled the bullet out of the case and stuck it in the lands. Had I been able to chamber the rifle it would have been catastrophic. The bullet that got lodged in the lands had been damaged in some way and I wonder if the heavy resistance in the magazine had presented the cartridge to the feed ramps in a crooked manner. I have included pics of both the two gouge marks on bullet and case ( I've inverted the bullet so one can see the marks align) and a a second pic of what appears to be damage to the opposite side of the bullet done by the rifleing.
The brass catcher was one of the links as I never saw a case with a unfired primer eject. The 10 round magazine that struggled with 9 rounds was a second. My checking for a blockage I believe was the broken link that prevented a tragedy.
Be careful guys, take noting for granted and be very suspicious of anything out of the normal.
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I went to the range today primarily to do some 223 shooting but brought the Grendel upper along to do some accuracy testing with Hornady 123 SST factory. The 223 shooting went off uneventfully. I changed out uppers and began shooting the Hornadys. After a couple of 3 shot groups I decided to fire a full 10 round group. Here in NJ we are restricted to 10 round mags. I have a ASC 10 and I found it wouldn't load but 9 rounds. I manually chambered a round then inserted the mag with 9 more. First shot went off normally. Second was a click. Knowing that the Grendel has a reputation for unreliable magazines I presumed it was a mag problem. I manually worked the charging handle and tried again. Another click. Taking the rifle out of the rest I very carefully brought the handle to the rear and let it fly forward. It stripped a round but failed to chamber. Dropping the mag I had to bang the butt stock while pulling on the handle to extract the round. Here is one of those links...I was using Caldwell bras catcher and did not see the case when it came out. I reinserted the magazine and cycled the charging handle again. Another failure to chamber. I removed and looked for some blockage in the rifle and my blood ran cold. There was a bullet stuck in the lands. The first attempt to manually charge the rifle had pulled the bullet out of the case and stuck it in the lands. Had I been able to chamber the rifle it would have been catastrophic. The bullet that got lodged in the lands had been damaged in some way and I wonder if the heavy resistance in the magazine had presented the cartridge to the feed ramps in a crooked manner. I have included pics of both the two gouge marks on bullet and case ( I've inverted the bullet so one can see the marks align) and a a second pic of what appears to be damage to the opposite side of the bullet done by the rifleing.
The brass catcher was one of the links as I never saw a case with a unfired primer eject. The 10 round magazine that struggled with 9 rounds was a second. My checking for a blockage I believe was the broken link that prevented a tragedy.
Be careful guys, take noting for granted and be very suspicious of anything out of the normal.
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,,,,sorry couldn't resist. 
Hope your good luck continues.